# Relationship history for MSHA mine 1200582

Current hierarchy: **The Heritage Group → US Aggregates LLC → US Aggregates - Thorntown Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → US Aggregates - Thorntown Sand & Gravel; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Fairfield Builders Supply Corp → US Aggregates - Thorntown Sand & Gravel; 1950-01-01 to 1995-08-31; source msha-controller-operator-history
- **controller_controls_mine:** John O  Coffin → US Aggregates - Thorntown Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John O  Coffin → Fairfield Builders Supply Corp; 1950-01-01 to 1995-08-31; source msha-controller-operator-history
- **controller_controls_mine:** The Heritage Group → US Aggregates - Thorntown Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** The Heritage Group → US Aggregates - Thorntown Sand & Gravel; 1989-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Materials Company → US Aggregates - Thorntown Sand & Gravel; 1995-09-01 to 1998-05-20; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Materials Company; 1995-09-01 to 1998-05-20; source msha-controller-operator-history
- **operator_operates_mine:** U S Aggregates, Inc. → US Aggregates - Thorntown Sand & Gravel; 1998-05-21 to 2016-05-31; source msha-controller-operator-history
- **controller_controls_operator:** The Heritage Group → U S Aggregates, Inc.; 1998-05-21 to 2016-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → US Aggregates - Thorntown Sand & Gravel; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Materials Company; 2007-11-16 to 1998-05-20; source msha-controller-operator-history
- **operator_operates_mine:** Heritage Aggregates LLC → US Aggregates - Thorntown Sand & Gravel; 2016-06-01 to 2020-04-20; source msha-controller-operator-history
- **controller_controls_operator:** The Heritage Group → Heritage Aggregates LLC; 2016-06-01 to 2020-04-20; source msha-controller-operator-history
- **operator_operates_mine:** US Aggregates Inc → US Aggregates - Thorntown Sand & Gravel; 2020-04-21 to 2026-06-17; source msha-controller-operator-history
- **controller_controls_operator:** The Heritage Group → US Aggregates Inc; 2020-04-21 to 2026-06-17; source msha-controller-operator-history
- **operator_operates_mine:** US Aggregates LLC → US Aggregates - Thorntown Sand & Gravel; 2026-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** The Heritage Group → US Aggregates LLC; 2026-06-18 to current/open; source msha-controller-operator-history